meillo@0: /*  MasqMail
meillo@0:     Copyright (C) 1999-2001 Oliver Kurth
meillo@224:     Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
meillo@0: 
meillo@0:     This program is free software; you can redistribute it and/or modify
meillo@0:     it under the terms of the GNU General Public License as published by
meillo@0:     the Free Software Foundation; either version 2 of the License, or
meillo@0:     (at your option) any later version.
meillo@0: 
meillo@0:     This program is distributed in the hope that it will be useful,
meillo@0:     but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@0:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
meillo@0:     GNU General Public License for more details.
meillo@0: 
meillo@0:     You should have received a copy of the GNU General Public License
meillo@0:     along with this program; if not, write to the Free Software
meillo@0:     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0: */
meillo@0: 
meillo@0: #include "masqmail.h"
meillo@0: #include "readsock.h"
meillo@0: 
meillo@10: gchar *prot_names[] = {
meillo@10: 	"local",
meillo@10: 	"bsmtp",
meillo@10: 	"smtp",
meillo@10: 	"esmtp",
meillo@10: 	"(unknown)"  /* should not happen, but better than crashing. */
meillo@0: };
meillo@0: 
meillo@10: static gchar*
meillo@10: string_base62(gchar * res, guint value, gchar len)
meillo@0: {
meillo@10: 	static gchar base62_chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
meillo@10: 	gchar *p = res + len;
meillo@14: 	*p = '\0';
meillo@10: 	while (p > res) {
meillo@10: 		*(--p) = base62_chars[value % 62];
meillo@10: 		value /= 62;
meillo@10: 	}
meillo@10: 	return res;
meillo@0: }
meillo@0: 
meillo@10: static gint
meillo@10: _g_list_addr_isequal(gconstpointer a, gconstpointer b)
meillo@0: {
meillo@10: 	address *addr1 = (address *) a;
meillo@10: 	address *addr2 = (address *) b;
meillo@10: 	int ret;
meillo@0: 
meillo@270: 	if ((ret = strcasecmp(addr1->domain, addr2->domain)) == 0) {
meillo@10: 		return strcmp(addr1->local_part, addr2->local_part);
meillo@270: 	}
meillo@270: 	return ret;
meillo@0: }
meillo@0: 
meillo@0: /* accept message from anywhere.
meillo@276:    A message from local is indicated by msg->recieved_host == NULL
meillo@0: 
meillo@276:    The -t option: With the ACC_RCPT_FROM_HEAD flag the addrs found found
meillo@276:    in To/Cc/Bcc headers are added to the recipient list.
meillo@0: */
meillo@0: 
meillo@10: accept_error
meillo@10: accept_message_stream(FILE * in, message * msg, guint flags)
meillo@0: {
meillo@10: 	gchar *line, *line1;
meillo@10: 	int line_size = MAX_DATALINE;
meillo@10: 	gboolean in_headers = TRUE;
meillo@10: 	header *hdr = NULL;
meillo@10: 	gint line_cnt = 0, data_size = 0;
meillo@0: 
meillo@10: 	line = g_malloc(line_size);
meillo@14: 	line[0] = '\0';
meillo@0: 
meillo@10: 	while (TRUE) {
meillo@10: 		int len = read_sockline1(in, &line, &line_size, 5 * 60, READSOCKL_CVT_CRLF);
meillo@0: 
meillo@10: 		line1 = line;
meillo@0: 
meillo@110: 		if ((line[0] == '.') && (!(flags & ACC_DOT_IGNORE))) {
meillo@10: 			if (line[1] == '\n') {
meillo@10: 				g_free(line);
meillo@10: 				break;
meillo@10: 			}
meillo@10: 			line1++;
meillo@10: 		}
meillo@10: 
meillo@270: 		if ((len == -1) && (flags & (ACC_DOT_IGNORE | ACC_NODOT_RELAX))) {
meillo@270: 			/* we got an EOF, and the last line was not terminated by a CR */
meillo@270: 			gint len1 = strlen(line1);
meillo@270: 			if (len1 > 0) {  /* == 0 is 'normal' (EOF after a CR) */
meillo@270: 				if (line1[len1 - 1] != '\n') {  /* some mail clients allow unterminated lines */
meillo@270: 					line1[len1] = '\n';
meillo@270: 					line1[len1 + 1] = '\0';
meillo@270: 					msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
meillo@270: 					data_size += strlen(line1);
meillo@270: 					line_cnt++;
meillo@10: 				}
meillo@270: 			}
meillo@270: 			break;
meillo@270: 
meillo@270: 		} else if (len == -1) {
meillo@270: 			g_free(line);
meillo@270: 			return AERR_EOF;
meillo@270: 
meillo@270: 		} else if (len == -2) {
meillo@270: 			/* should not happen any more */
meillo@270: 			g_free(line);
meillo@270: 			return AERR_OVERFLOW;
meillo@270: 
meillo@270: 		} else if (len == -3) {
meillo@270: 			g_free(line);
meillo@270: 			return AERR_TIMEOUT;
meillo@270: 
meillo@270: 		} else if (len <= 0) {
meillo@270: 			/* does not happen */
meillo@270: 			g_free(line);
meillo@270: 			DEBUG(5) debugf("read_sockline returned %d\n", len);
meillo@270: 			return AERR_UNKNOWN;
meillo@270: 
meillo@270: 		}
meillo@270: 
meillo@270: 		if (in_headers) {
meillo@270: 
meillo@270: 			/* some pop servers send the 'From ' line, skip it: */
meillo@270: 			if (!msg->hdr_list && strncmp(line1, "From ", 5) == 0) {
meillo@270: 				continue;
meillo@270: 			}
meillo@270: 
meillo@270: 			if (line1[0] == ' ' || line1[0] == '\t') {
meillo@270: 				/* continuation of 'folded' header: */
meillo@270: 				if (hdr) {
meillo@270: 					hdr->header = g_strconcat(hdr->header, line1, NULL);
meillo@270: 				}
meillo@270: 
meillo@270: 			} else if (line1[0] == '\n') {
meillo@270: 				/* an empty line marks end of headers */
meillo@270: 				in_headers = FALSE;
meillo@10: 			} else {
meillo@270: 				/* in all other cases we expect another header */
meillo@270: 				if ((hdr = get_header(line1))) {
meillo@270: 					msg->hdr_list = g_list_append(msg->hdr_list, hdr);
meillo@10: 				} else {
meillo@270: 					/* if get_header() returns NULL, no header was recognized,
meillo@270: 					   so this seems to be the first data line of a broken mailer
meillo@270: 					   which does not send an empty line after the headers */
meillo@270: 					in_headers = FALSE;
meillo@270: 					msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
meillo@10: 				}
meillo@10: 			}
meillo@10: 		} else {
meillo@270: 			/* message body */
meillo@270: 			msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
meillo@270: 			data_size += strlen(line1);
meillo@270: 			line_cnt++;
meillo@270: 		}
meillo@10: 
meillo@120: 		if (conf.max_msg_size && (data_size > conf.max_msg_size)) {
meillo@117: 			DEBUG(4) debugf("accept_message_stream(): "
meillo@117: 					"received %d bytes (conf.max_msg_size=%d)\n",
meillo@117: 			                data_size, conf.max_msg_size);
meillo@117: 			return AERR_SIZE;
meillo@117: 		}
meillo@117: 
meillo@0: 	}
meillo@0: 
meillo@270: 	DEBUG(4) debugf("received %d lines of data (%d bytes)\n", line_cnt, data_size);
meillo@270: 
meillo@270: 	if (!msg->data_list) {
meillo@10: 		/* make sure data list is not NULL: */
meillo@10: 		msg->data_list = g_list_append(NULL, g_strdup(""));
meillo@270: 	}
meillo@270: 	msg->data_list = g_list_reverse(msg->data_list);
meillo@0: 
meillo@10: 	/* we get here after we succesfully received the mail data */
meillo@0: 
meillo@10: 	msg->data_size = data_size;
meillo@10: 	msg->received_time = time(NULL);
meillo@0: 
meillo@10: 	return AERR_OK;
meillo@0: }
meillo@0: 
meillo@10: accept_error
meillo@10: accept_message_prepare(message * msg, guint flags)
meillo@0: {
meillo@10: 	struct passwd *passwd = NULL;
meillo@10: 	time_t rec_time = time(NULL);
meillo@0: 
meillo@10: 	DEBUG(5) debugf("accept_message_prepare()\n");
meillo@0: 
meillo@10: 	/* create unique message id */
meillo@10: 	msg->uid = g_malloc(14);
meillo@0: 
meillo@10: 	string_base62(msg->uid, rec_time, 6);
meillo@10: 	msg->uid[6] = '-';
meillo@10: 	string_base62(&(msg->uid[7]), getpid(), 3);
meillo@10: 	msg->uid[10] = '-';
meillo@10: 	string_base62(&(msg->uid[11]), msg->transfer_id, 2);
meillo@10: 	msg->uid[13] = 0;
meillo@0: 
meillo@10: 	/* if local, get password entry */
meillo@10: 	if (msg->received_host == NULL) {
meillo@10: 		passwd = g_memdup(getpwuid(geteuid()), sizeof(struct passwd));
meillo@10: 		msg->ident = g_strdup(passwd->pw_name);
meillo@10: 	}
meillo@0: 
meillo@10: 	/* set return path if local */
meillo@22: 	if (msg->return_path == NULL && msg->received_host == NULL) {
meillo@22: 		gchar *path = g_strdup_printf("<%s@%s>", passwd->pw_name, conf.host_name);
meillo@22: 		DEBUG(3) debugf("setting return_path for local accept: %s\n", path);
meillo@22: 		msg->return_path = create_address(path, TRUE);
meillo@22: 		g_free(path);
meillo@10: 	}
meillo@0: 
meillo@10: 	/* scan headers */
meillo@10: 	{
meillo@10: 		gboolean has_id = FALSE;
meillo@10: 		gboolean has_date = FALSE;
meillo@10: 		gboolean has_sender = FALSE;
meillo@10: 		gboolean has_from = FALSE;
meillo@10: 		gboolean has_to_or_cc = FALSE;
meillo@10: 		GList *hdr_node, *hdr_node_next;
meillo@10: 		header *hdr;
meillo@0: 
meillo@10: 		for (hdr_node = g_list_first(msg->hdr_list);
meillo@10: 		     hdr_node != NULL; hdr_node = hdr_node_next) {
meillo@10: 			hdr_node_next = g_list_next(hdr_node);
meillo@10: 			hdr = ((header *) (hdr_node->data));
meillo@10: 			DEBUG(5) debugf("scanning headers: %s", hdr->header);
meillo@10: 			switch (hdr->id) {
meillo@10: 			case HEAD_MESSAGE_ID:
meillo@10: 				has_id = TRUE;
meillo@10: 				break;
meillo@10: 			case HEAD_DATE:
meillo@10: 				has_date = TRUE;
meillo@10: 				break;
meillo@10: 			case HEAD_FROM:
meillo@10: 				has_from = TRUE;
meillo@10: 				break;
meillo@10: 			case HEAD_SENDER:
meillo@10: 				has_sender = TRUE;
meillo@10: 				break;
meillo@10: 			case HEAD_TO:
meillo@10: 			case HEAD_CC:
meillo@106: 				has_to_or_cc = TRUE;
meillo@106: 				/* fall through */
meillo@10: 			case HEAD_BCC:
meillo@10: 				if (flags & ACC_RCPT_FROM_HEAD) {
meillo@109: 					/* -t option (see comment above) */
meillo@10: 					DEBUG(5) debugf("hdr->value = %s\n", hdr->value);
meillo@10: 					if (hdr->value) {
meillo@10: 						msg->rcpt_list = addr_list_append_rfc822(msg->rcpt_list, hdr->value, conf.host_name);
meillo@10: 					}
meillo@10: 				}
meillo@106: 				if (hdr->id == HEAD_BCC) {
meillo@10: 					DEBUG(3) debugf("removing 'Bcc' header\n");
meillo@10: 					msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
meillo@10: 					g_list_free_1(hdr_node);
meillo@10: 					destroy_header(hdr);
meillo@106: 				}
meillo@10: 				break;
meillo@10: 			case HEAD_ENVELOPE_TO:
meillo@10: 				if (flags & ACC_SAVE_ENVELOPE_TO) {
meillo@10: 					DEBUG(3) debugf("creating 'X-Orig-Envelope-To' header\n");
meillo@22: 					msg->hdr_list = g_list_prepend(msg->hdr_list, create_header(HEAD_UNKNOWN,
meillo@276: 					                               "X-Orig-Envelope-To: %s", hdr->value));
meillo@10: 				}
meillo@10: 				DEBUG(3) debugf("removing 'Envelope-To' header\n");
meillo@10: 				msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
meillo@10: 				g_list_free_1(hdr_node);
meillo@10: 				destroy_header(hdr);
meillo@10: 				break;
meillo@10: 			case HEAD_RETURN_PATH:
meillo@10: 				if (flags & ACC_MAIL_FROM_HEAD) {
meillo@10: 					/* usually POP3 accept */
meillo@10: 					msg->return_path = create_address_qualified(hdr->value, TRUE, msg->received_host);
meillo@10: 					DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
meillo@10: 				}
meillo@10: 				DEBUG(3) debugf("removing 'Return-Path' header\n");
meillo@10: 				msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
meillo@10: 				g_list_free_1(hdr_node);
meillo@10: 				destroy_header(hdr);
meillo@10: 				break;
meillo@10: 			default:
meillo@10: 				break;  /* make compiler happy */
meillo@10: 			}
meillo@10: 		}
meillo@10: 
meillo@10: 		if (msg->return_path == NULL) {
meillo@10: 			/* this can happen for pop3 accept only and if no Return-path: header was given */
meillo@10: 			GList *hdr_list;
meillo@10: 			header *hdr;
meillo@10: 
meillo@10: 			DEBUG(3) debugf("return_path == NULL\n");
meillo@10: 
meillo@10: 			hdr_list = find_header(msg->hdr_list, HEAD_SENDER, NULL);
meillo@10: 			if (!hdr_list)
meillo@10: 				hdr_list = find_header(msg->hdr_list, HEAD_FROM, NULL);
meillo@10: 			if (hdr_list) {
meillo@10: 				gchar *addr;
meillo@10: 				hdr = (header *) (g_list_first(hdr_list)->data);
meillo@10: 
meillo@10: 				DEBUG(5) debugf("hdr->value = '%s'\n", hdr->value);
meillo@10: 
meillo@10: 				addr = g_strdup(hdr->value);
meillo@10: 				g_strchomp(addr);
meillo@10: 
meillo@10: 				if ((msg->return_path = create_address_qualified(addr, FALSE, msg->received_host)) != NULL) {
meillo@10: 					DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
meillo@13: 					msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN,
meillo@13: 					                              "X-Warning: return path set from %s address\n",
meillo@13: 					                              hdr->id == HEAD_SENDER ? "Sender:" : "From:"));
meillo@10: 				}
meillo@10: 				g_free(addr);
meillo@10: 			}
meillo@10: 			if (msg->return_path == NULL) {  /* no Sender: or From: or create_address_qualified failed */
meillo@10: 				msg->return_path = create_address_qualified("postmaster", TRUE, conf.host_name);
meillo@10: 				DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
meillo@13: 				msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN,
meillo@25: 				                              "X-Warning: real return path is unknown\n"));
meillo@10: 			}
meillo@10: 		}
meillo@10: 
meillo@10: 		/* here we should have our recipients, fail if not: */
meillo@276: 		if (!msg->rcpt_list) {
meillo@10: 			logwrite(LOG_WARNING, "no recipients found in message\n");
meillo@10: 			return AERR_NORCPT;
meillo@10: 		}
meillo@10: 
meillo@10: 		if (!(has_sender || has_from)) {
meillo@10: 			DEBUG(3) debugf("adding 'From' header\n");
meillo@10: 			msg->hdr_list = g_list_append(msg->hdr_list,
meillo@10: 			                msg->full_sender_name
meillo@10: 			                ?
meillo@13: 			                  create_header(HEAD_FROM, "From: \"%s\" <%s@%s>\n", msg->full_sender_name,
meillo@13: 			                                msg->return_path->local_part, msg->return_path->domain)
meillo@10: 			                :
meillo@10: 			                  create_header(HEAD_FROM, "From: <%s@%s>\n",
meillo@13: 			                                msg->return_path->local_part, msg->return_path->domain)
meillo@10: 			                );
meillo@10: 		}
meillo@106: 		if (!has_to_or_cc) {
meillo@106: 			DEBUG(3) debugf("no To: or Cc: header, hence adding `To: undisclosed recipients:;'\n");
meillo@105: 			msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_TO, "To: undisclosed-recipients:;\n"));
meillo@10: 		}
meillo@10: 		if (!has_date) {
meillo@10: 			DEBUG(3) debugf("adding 'Date:' header\n");
meillo@10: 			msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_DATE, "Date: %s\n", rec_timestamp()));
meillo@10: 		}
meillo@10: 		if (!has_id) {
meillo@10: 			DEBUG(3) debugf("adding 'Message-ID:' header\n");
meillo@13: 			msg->hdr_list = g_list_append(msg->hdr_list,
meillo@13: 			                              create_header(HEAD_MESSAGE_ID, "Message-ID: <%s@%s>\n", msg->uid, conf.host_name));
meillo@10: 		}
meillo@0: 	}
meillo@10: 
meillo@10: 	/* Received header: */
meillo@10: 	/* At this point because we have to know the rcpts for the 'for' part */
meillo@102: 	gchar *for_string = NULL;
meillo@102: 	header *hdr = NULL;
meillo@10: 
meillo@102: 	DEBUG(3) debugf("adding 'Received:' header\n");
meillo@10: 
meillo@102: 	if (g_list_length(msg->rcpt_list) == 1) {
meillo@102: 		address *addr = (address *) (g_list_first(msg->rcpt_list)->data);
meillo@102: 		for_string = g_strdup_printf(" for %s", addr_string(addr));
meillo@102: 	}
meillo@10: 
meillo@289: 	if (!msg->received_host) {
meillo@102: 		/* received locally */
meillo@289: 		hdr = create_header(HEAD_RECEIVED,
meillo@289: 		    "Received: from %s by %s with %s (%s %s) id %s%s; %s\n",
meillo@289: 		    passwd->pw_name, conf.host_name,
meillo@289: 		    prot_names[msg->received_prot], PACKAGE, VERSION,
meillo@289: 		    msg->uid, for_string ? for_string : "", rec_timestamp());
meillo@102: 	} else {
meillo@102: 		/* received from remote */
meillo@10: #ifdef ENABLE_IDENT
meillo@102: 		DEBUG(5) debugf("adding 'Received:' header (5)\n");
meillo@289: 		hdr = create_header(HEAD_RECEIVED,
meillo@289: 		    "Received: from %s (ident=%s) by %s with %s (%s %s) id %s%s; %s\n",
meillo@289: 		    msg->received_host, msg->ident ? msg->ident : "unknown",
meillo@289: 		    conf.host_name, prot_names[msg->received_prot], PACKAGE,
meillo@289: 		    VERSION, msg->uid, for_string ? for_string : "",
meillo@289: 		    rec_timestamp());
meillo@10: #else
meillo@289: 		hdr = create_header(HEAD_RECEIVED,
meillo@289: 		    "Received: from %s by %s with %s (%s %s) id %s%s; %s\n",
meillo@289: 		    msg->received_host, conf.host_name,
meillo@289: 		    prot_names[msg->received_prot], PACKAGE, VERSION,
meillo@289: 		    msg->uid, for_string ? for_string : "", rec_timestamp());
meillo@10: #endif
meillo@102: 	}
meillo@102: 	header_fold(hdr);
meillo@102: 	msg->hdr_list = g_list_prepend(msg->hdr_list, hdr);
meillo@10: 
meillo@102: 	if (for_string)
meillo@102: 		g_free(for_string);
meillo@0: 
meillo@10: 	return AERR_OK;
meillo@0: }
meillo@0: 
meillo@10: accept_error
meillo@10: accept_message(FILE * in, message * msg, guint flags)
meillo@0: {
meillo@10: 	accept_error err;
meillo@0: 
meillo@10: 	err = accept_message_stream(in, msg, flags);
meillo@270: 	if (err == AERR_OK) {
meillo@10: 		err = accept_message_prepare(msg, flags);
meillo@270: 	}
meillo@0: 
meillo@10: 	return err;
meillo@0: }